Abstract

Spectrograms which illustrate energy distribution were prepared of green flames produced by pyrotechnic compositions. The observed suppression of MgO and BaO emission is a decreasing function of the effective emitting temperature of the flame. The ratio BaO/BaCl is shown to be an increasing function of effective emitting temperature, accompanied by a shift of hue toward yellow and a reduction in excitation purity. By analogy to BaF and BaOH, it is proposed that the BaCl dissociation energy is near 100 kcal/mole. Although evidence concerning the emission contribution of BaOH is inconclusive, it is suggested that BaOH is a substantial contributor. The effective emissivity is estimated for each of the test groups. The experiments verify that brightness temperatures less than 2200°K are required for satisfactory green-flame production and demonstrate that polyvinyl chloride is more effective than potassium perchlorate when used as a chlorine donor in green pyrotechnic flames.

© 1965 Optical Society of America

Visible Radiation from Illuminating-Flare Flames: Strong Emission Features*†

Bernard E. Douda, Robert M. Blunt, and Edward J. Bair
J. Opt. Soc. Am. 60(8) 1116-1119 (1970)

Total Hemispherical Emissivity of Sapphire

A. M. Wittenberg
J. Opt. Soc. Am. 55(4) 432-435 (1965)

Emissivity of Water Vapor at 1200°K in the 1.9- and 2.7-µ Regions*

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Measurement of Color Appearance

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Spectroscopic Study of the Early Helium Afterglow*

William S. Bickel and C. R. Burnett
J. Opt. Soc. Am. 55(11) 1504-1508 (1965)